67
BURNER CONTROL FAULT
–
This routine monitors the gas return valve signal and compares it with the
Direct Spark Ignition (DSI) purge time setting. If the gas return valve signal does not turn on by the DSI purge
time expires or if it turns on for less than 200 ms, the Phase 7 dual microprocessor controller (DMC) computer
will turn off the heat output, increase a counter and wait the interpurge time before reattempting to ignite the
burner. Once this fault condition occurs five (5) consecutive times, the Phase 7 DMC (computer) will interrupt
the cycle and will display “BURNER CONTROL FAULT” and will go into a Fault Mode with a brief audio
indication. If the basket (tumbler) temperature is above 100°F (38°C) at the time of the failure, the
Phase 7 DMC (computer) will continue to display “BURNER CONTROL FAULT” while the dryer cools by
running with no heat for 3 minutes or until the temperature drops below 100°F (38°C). If the basket (tumbler)
temperature is below 100°F (38°C), or the 3 minutes expire, the Phase 7 DMC (computer) will shut off
ALL
outputs and will remain in Fault Mode until the dryer is addressed.
IGNITION FAULT
– After the Phase 7 DMC (computer) receives a gas valve return for more than 200 ms
signal within the DSI purge time, the Phase 7 DMC (computer) will begin a DSI proof time. The Phase 7 DMC
(computer) will continue to recheck the gas valve return signal. If the signal is lost during the DSI proof time, the
Phase 7 DMC (computer) will turn off the heat output and will determine what the retry count is set at. If the
retry count is greater than zero, the Phase 7 DMC (computer) will wait the interpurge time and will attempt to
reignite the flame. If the failure condition occurs again, the Phase 7 DMC (computer) will retry until the retry
count has been satisfied. Once the retry count has been satisfied, the Phase 7 DMC (computer) will interrupt the
cycle and will display “IGNITION FAULT” condition and will go into a Fault Mode with a brief audio indication.
If the basket (tumbler) temperature is above 100°F (38°C), the Phase 7 DMC (computer) will continue to display
“IGNITION FAULT” while the dryer cools by running with no heat for 3 minutes or until the temperature drops
below 100°F (38°C). Once the basket (tumbler) temperature is below 100°F (38°C), or the 3 minutes expire, the
Phase 7 DMC (computer) will shut off
ALL
outputs and will remain in Fault Mode until dryer is addressed.
FLAME FAULT
– After the Phase 7 DMC (computer) has verified that the gas valve signal was present throughout
the DSI purge time and the DSI proof time, the Phase 7 DMC (computer) will continue to monitor the gas valve
return signal. In the event that the gas valve return signal is lost anytime after the DSI proof time, the
Phase 7 DMC (computer) will turn off the heat output and will increase a counter. Once this fault condition
occurs five (5) consecutive times, the Phase 7 DMC (computer) will interrupt the cycle and will display
“FLAME FAULT” condition and will go into a Fault Mode with a brief audio indication. If the basket (tumbler)
temperature is above 100°F (38°C), the Phase 7 DMC (computer) will continue to display “FLAME FAULT”
while the dryer cools by running with no heat for 3 minutes or until the temperature drops below 100°F (38°C).
Once the basket (tumbler) temperature is below 100°F (38°C), or the 3 minutes expire, the Phase 7 DMC
(computer) will shut off
ALL
outputs and will remain in Fault Mode until the dryer is addressed.
CLEAN LINT
– This routine monitors the opening of the lint drawer switch and compares the time between
openings to the Lint Cleaning Frequency setting. This routine will first prompt the user to clean lint before locking
out the dryer. Once the time between cleanings is equal to the Lint Cleaning Frequency setting, the display will
prompt the user to clean lint. The Lint Cleaning Frequency limits the amount of time the dryer will run before the
Phase 7 DMC (computer) locks the dryer out for further use. If the lint drawer is not cleaned within
2 hours of run time, the Phase 7 DMC (computer) will be locked out.
CHECK CONTROL BOARD FUSE #1
– This routine identifies the opening of the main fuse (fuse 1) on the
Phase 7 DMC (computer). If the fuse has opened, the Phase 7 DMC (computer) will not allow a cycle to begin
and will display “CHECK CONTROL BOARD FUSE #1” condition. If the fuse has opened after the cycle has
begun, it will still trigger the CHECK CONTROL BOARD FUSE #1. The dryer will shut off
ALL
outputs and
will go into a Fault Mode with a brief audio indication. The Phase 7 DMC (computer) will then monitor the
Phase 7 DMC (computer) Fuse #1 Input. If the Phase 7 DMC (computer) Fuse #1 signal returns for more than
30-seconds, the Phase 7 DMC (computer) will reset itself and will return to Ready Mode.
Summary of Contents for Phase 7.4.2 DMC None
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